John w



(NoModeL) v -J. W. GILBERT.

DENTAL PLUG-GER.

No. 402,156. Patented Apr. 30, 1889.-

UNITED STATES PATENT OFFICE.

JOHN W. GILBERT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE S. S. WHITE DENTAL MANUFACTURING COMPANY, OF SAME PLACE.

DENTAL PLUGGER.

SPEGIFIQATION forming part of Letters Patent No. 402,156, dated April 30, 1889. Application filed October 11, 1887- Serial No. 252,006. (No model.)

50 all whom it may concern..-

Be it known that 1, JOHN W. GILBERT, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Dental Pluggers; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in mechanical tooth-plugging instruments, and more particularly to an improvement upon the improved revolving hammer-plugger invented by Dr. William G. A. Bonwill, of the city of Philadelphia; and its objects are to improve the Bonwill instrument, so that the usual long-handled hand plugging-tools may be employed therewith.

My invention is also based upon the toolcarrying and blow-delivering devices of the well-known electro-magnetic plugger, in which there is a hand-piece casing having a slotted or open side for the access of the thumb to turn the tool-carrying devices, a spring-retracted tool carrying spindle fitted to be moved endwise or reciprocate in said casing and carrying an operating tool or point at its front end, and an independent adjustable striking-plunger, which receives the blows of the hammer and imparts them to the rear end of said tool-carrying spindle, which general organization I make use of in my improved instrument.

The nature of my invention will be more fully understood from the detailed description thereof which follows, and by aid of the accompanying drawings, illustrating my said lmprovements.

The subject-matter claimed by me as my invention is also distinctly recited in a summary at the close of this specification.

In said drawings, Figure 1 is a View in elevation of my improved instrument. 1 Fig. 2 is a longitudinal section therethrough as to the parts to which my invention more particularly relates. Fig. 3 is a view in elevation of the coupling-sleeve and screw-nut by which the casing-sections are detachably united together. Fig. at is a longitudinal section through the central endwise-movable tubular tool-carrying spindle, showing the long-handled hand plugging-tool as fitted therein and retained by the springs at the front end thereof, and also showing the striking-plunger at the end of said sleeve in elevation. Fig. 5 is a' view of the rear hand-piece casingsection to which the front section is detachably secured by means of the coupling-sleeve and screw-nut. (Shown more particularly in Figs. 2 and Fig. 6 is a view in elevation of the long-handled hand plugging-tool. Fig.

'7 is a modified form of the connecting-sleeve at the rear end of the instrument by which it is coupled to a dental engine to be driven;

and Fig. 8 is another modification of the coupling device by which the instrument may be attach ed to the hand-piece of a dental engine to be driven.

The rear end of the instrument is fitted with a coupling-sleeve, A, and yoke A, provided with bearings for the rotary drivingshaft B, affording a means of fitting the instrument to a dental engine, so as to have This axis -pin also passes In Fig. 7 I have shown a modified sleeve and yoke connection, which is fitted to the hand-piece of a dental engine, so as to drive the revolving hammer by the tool chuck or spindle of such a hand-piece in awell-known wa I 11 Fig. 8 I show another modification of the driving-connection, which is fitted to be insorted in the revolving chuck or tool-holder of a dental hand-piece, and with a yielding driving-spring connection between the driving-shank and the forked frame A.

The revolving hammer O is fitted with a radial projection, 0 which, when the instrument is in operation and the hammer is being rapidly revolved, strikes a rapid series of I60 blows upon the rear end of a striking-plunger, E. Said plunger E is fitted by an annular shoulder, e, at its front end in a confiningcap, f, of an endwise-movable tubular toolcarrying spindle, I, fitted in an outside casing, G, which may be of hard rubber and constitutes the handle-section of the instrument. Said handle-section G of the casing is connected with the rear section, D, by means of a screw-sleeve, II, and a rotary coupling-nut, I, fitted to revolve without endwise movement upon said screw-sleeve II and between it and the rear end of the casing-section G. Said nut I is internally screw-threaded, and is fitted to be screwed upon the front tubular end of the rear casing-section, D, so as to unite said easing-sections together, with a capability of being readily separated when desired. Between the front annular edge of the plungerconfining cap f and the annular shoulder 71 in the screw-sleeve H is con fined a spiral spring, S, the power of which is exerted to thrust said tool carrying spindle I backward, the extent of its backward movement being determined by an adjustable screw-collar, J, in the rear end of said rear easing-section, D. This scre'iv-collar is adjustable by means of a pinion, K, on its end and a screw, L, in said frame D; but this particular adjusting device is notclaimed by me, as it is of said Bonwills invention. The endwise-movable spindle F is provided at its front end with an annular shoulder, f, which normally stands a short distance from the front end of the casing G. (See Fig. 1.) In order to adjust the strength of the blow delivered by the hammer, the screw-collar J is turned in or out, so as to determine the distance between the end of the striking-plunger E and the revolving hammer projection. Said striking-plunger E has slight endwise playin its confining-cap f, and is thrust back to its limit of movement by inserting the long -handled hand pluggingtool in the tool-carrying spindle, said tool being confined in said spindle by means of the retracting-springs m 7!), carried by the front end of said spindle.

One side of the casin -section G and toolcarrying spindle F is cut away, so as to admit access of the thumb to the surface of the tool in said spindle, so as to permit it to be revolved in operation to direct its operatingpoint as desired. This is an old expedient. In order, however, to enable the tool-carrying spindle to be thrust forward by the pressure from the thumb of the operator, so as to carry the butt-end of the striking-plunger away from the hammer projectionas when picking up gold, for instance-I provide said spindle with a radial thumb projection, f so as to receive the direct forward pressure of the thumb. The instrument may also be provided with a linger-ring, N, if desired, so as to enable it to be more securely held in the hand.

lVith the parts in the position shown in Fig. l the operation is as follows: Motion being communicated to the revolving hammer 0, its hammer projection c imparts a rapid series of blows upon the butt-end of the strikingplunger E, which by an interposed noise-reducing rubber block are imparted to the rear end of the plugging-tool L, each blow driving the plunger and the tool forward in the toolcarrying spindle and effecting its work upon the filling, and after each blow said tool is retracted in the tool-carrying spindle by means of the retractin springs m min readiness to receive the next blow. If it be desired to stop the administration of blows upon the tool, the pressure of the thumb is exerted upon the thumb projection f of the tool-carrying spindle, carrying it forward and the tool and striking-plunger also with it, so as to be out of reach of the hammer projection 0 whereby the blows are stopped without stopping the rotation of the engine. Pressure of the thumb being released, the spindle is immediately thrust back in the casing by the retractingspring S to carry the butt-end of the plunger in line to be struck by the hammer. lf the strength of the blows as being administered is of the force not desired, the strength of the blows may be increased or diminished by adjusting the screw-collar J so as to enable the buttend of the strikingplunger to be brought nearer to or withdrawn farther from the striking projection of the hammer.

I claim as my invention The combination of the casing, the toolcarryiug spindle fitted to be moved endwise in said casing, the tool-retaining device of said spindle, and the independent strikingplunger carried by said spindle and fitted to reciprocate independently of the reciprocation of said spindle, so as to impart the blows received from the hammer directly to an operating-tool inserted in said spindle, substantially as described.

2. The combination of the casing, the toolcarrying spindle fitted to be moved endwise in said casin g, the retracting-spring between said spindle and easing, the tool-retainin g device of said spindle, and the independent striking-plunger carried by said spindle and fitted to reciprocate independently of the reciprocation of said spindle, so as to impart the blows received from the hammer directly to an operating-tool inserted in said spindle, substantially as described.

3. The combination of the casing, the tubu lar spindle movable endwise in said casing, the tool-retaining device of said spindle, the independent striking-plunger carried by said spindle at its rear end, and the adjusting device to limit the inward thrust of said spindle, and thereby the relation of the strikingplunger to its hammer, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

J OI'Ib \V. GILBERT.

\Vitnesscs:

ELI T. STARR, P. GEO. VINSON, Jr. 

